Ignition Coils & Spark Plugsīefore getting into the mod guide below, we want to talk about the importance of fresh ignition coils and spark plugs, especially on a vehicle that is two decades old. So some of the upgrades below may seem unnecessary, but this will build a monster MK4 GTI and will turn heads on the streets. The way we look at it is an MK4 GTI will more than likely be a project car if you’re looking to mod it out.
Volkswagen also released the MK4 GTI 337/25th Anniversary edition that had the same 1.8t engine but came with a 6-speed manual transmission option instead. It featured a K03 sport turbo with a 5-speed automatic Tiptronic transmission or a 5-speed manual transmission. Although it may not seem like a lot of power nowadays, this was revolutionary back in the early 2000’s. The 1.8L Turbo engine put down 178hp and 173lb-ft. However, Volkswagen moved to a 1.8L Turbo engine in 2000 through 2005 for the GTI. When the MK4 GTI was first introduced, it featured a 2.0L but that only lasted one model year, 1999.5. The Volkswagen MK4 GTI was first introduced in 1999 and ran production through 2005.
The 5 Best Performance Mods for the MK4 GTI This concludes your installation and should have you all wired up! Let us know if you have any questions or comments below.Disclosure: This post may contain affiliate links, meaning when you click the links and make a purchase, we receive a commission. Make sure the cover does not pinch any wires when installed. Connect the brown (ground) wire from the relay harness to the negative battery terminal.
Secure the wire to the main battery cable with tie wraps.Place the fuse holder where you can reach it later, should you need to replace the fuse.Bolt the red wire with the inline fuse to the positive battery terminal.Push the switch straight into the dash opening until it clicks in place.
Secure the wire beneath the dash with zip ties.Route the blue wire up from the underdash area, and pull it through the light switch opening in the dashboard.Squeeze the retainer clips on the wire harness connector and pull the plastic connector out of the switch.If your car has a stock switch with no fog light setting, you’ll need to order one (ES8602). This car already has a Euro headlight switch with fog light setting.Then pull the switch straight out of the dash.Press in on the light switch knob and while turning it clockwise until it stops.Remove the light switch from the dashboard Reach up and pull the blue wire through the grommet into the interior, beneath the dash. Remove the Torx® screws securing the underdash panel, then drop it down. Run the blue wire through the rubber grommet in the firewall, located just above the brake booster. Locate one of the two available grommets in the firewall to route the blue harness wire into the cabin. Run the blue wire through the firewall to the interior.
This can be easily removed with a small flat-blade screwdriver or pick. Service Tip: You may need to remove a small green rubber plug from the pin 2 location to make room for the new wire. Push the purple plastic retainer back in place to lock all the wires in the connector, then repeat this step at the other headlight. Insert a yellow harness wire into the pin 2 location of each headlight connector (This will supply power to the fog light through the main OEM connector). Use a small screwdriver or punch to slide the purple plastic terminal retainer (arrow) out of the electrical connector.
Route one of the two yellow wires from the relay harness to a headlight connector. Just make sure the power (red) and ground (brown) wires in the relay harness can reach the battery terminals Step 2
Here, we remove the plastic hood cable shield (two screws, top arrows), then drill a hole in the shield to mount the relay.ĭrilling two extra holes let us tie wrap the harness wires to the cover. Mount the fog lamp relay (lower arrow) in the engine compartment near the battery. This instruction manual will take you through the process and help you get on your way to a sharper look and higher visibility. Want to activate the fogs in your MK4 VW? This wiring harness kit will allow you to use a factory set of fogs and wire them into your non-fog light equipped MK4 VW.